I am from Italy.
I live in Italy.
I am almost 50 years old.
Amazon is only the most popular choice of brand, but all other big companies act like that, unions or not.
I would say that here in Italy, were unions are pretty strong and have been historically even stronger for a long time, many companies have received undeserved favours simply because they employed hundreds of thousand of people (see FIAT in Italy) and in Italy the constitution at art. 1 says "Italy is a democratic Republic founded on labor" so everybody tries to preserve the jobs of those already employed, rising their salaries is not as important.
That's the bottom line, you might think people don't understand you, but truth is realism is necessary to address complex issues.
Another example is public schools in Italy, where unions prefer two teachers at a shitty salary than hire half of them with a substantially higher salary.
Why?
Because that's two jobs created instead of one, during their time, it sounds great in the brochure.
Of course not all unions are equal, of course some of them are fighting for better salaries, bit when the choice is between better salaries for less people or same old salary for more people, they will always chose the second.
What you get here is better social welfare, more work protection, paid holidays, paid sick leave, but much worse salaries than in US because that's not a priority, better salaries for everybody means that companies will start questioning why they should pay more people that can barely do their job, after years of doing the same thing over and over and nobody wants to discuss about that.
Unions first.
In Italy salary negotiation is mostly collective, if you hire someone to do job X at salary Y, you have to give the same amount of money to all other workers with the same job X.
If you hire Alice and Bob to do the same job and Alice is better than Bob, you can't pay her more than Bob. It's illegal. You can't even promote her at will if the contract requires a minimum seniority before stepping up (for example: minimum two years). I theory its purpose is to avoid favoritism, in practice it completely annihilate the incentive to do better at work.
The only way to negotiate a better salary is working as a contractor, which is another can of worm entirely here, and that also means renounce to almost all the protections.
Don't assume people don't know shit, try to assume people have experience on how a perfectly good solution in theory is going to fail miserably in practice.